12
The vertical speed display is the only function that can be accessed
directly in the operate mode, therefore, vertical speed changes can be
commanded by simply rotating the selector knob. If you are in the “En-
try” (ENT) mode you can access the VS Mode by selecting the VS button
and then rotating the selector for the desired vertical speed, however, you
must push DTA to return to “operate” mode before the selected VS will
be commanded.
The vertical speed selector function may be disabled by pushing the
manual “MAN” button which will extinguish the VS display and the “SEL”
annunciation on the optional autopilot remote annunciator display.
Automatic VS Select
If you select an altitude that requires an opposite polarity vertical speed,
the vertical speed command displayed will automatically change polarity
to match the direction of the altitude and also change to 500 FPM. For
example, if you climb to a selected altitude of 6000 ft., the vertical speed
display will show +3 or lower (+300 FPM climb) upon arrival. If you
next select 5000 ft., or lower, the vertical speed command will automati-
cally change polarity to a negative sign and 500 FPM, which will be dis-
played as -5 (-500 FPM descent).
Vertical Speed Compatibility Warning
In the above example, we selected a new altitude which was incom-
patible with the sign of the existing VS command and the system auto-
matically changed the vertical speed sign.
If we select a vertical speed that is incompatible with the existing
altitude displayed, the system will cause the altitude annunciation to flash
for 5 seconds to alert the operator of the existing incompatibility. The
system will not automatically change the altitude selected.
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